Edible PGA coating composition

Abstract

An edible, hardenable coating composition is disclosed which comprises high levels of low viscosity propylene glycol alginate and a surfactant, which may additionally contain a filler, a pigment and optionally a small amount of a secondary film former and/or a strengthening polymer. The coating composition of the present invention may be applied to pharmaceutical and veterinary solid dosage forms, confectionery, seeds, animal feed, fertilizers, pesticide tablets, and foods and provides an elegant prompt release coating which does not retard the release of active ingredients from the coated substrate.

1. A solid dosage form coated with an edible, hardenable, prompt release coating composition comprising 55% to 85% of propylene glycol alginate and up to 10% of a surfactant, wherein the propylene glycol alginate is a primary film former of the composition and such that a 1% aqueous solution thereof has a viscosity in the range of about 1 to 500 mPa·s at 25° C. 
     
     
       2. The solid dosage form of  claim 1 , wherein said solid dosage form is a pharmaceutical or veterinary tablet. 
     
     
       3. The solid dosage form of  claim 1 , wherein said coating composition is about 0.5% to about 4% by weight of said uncoated solid dosage form. 
     
     
       4. An edible, hardenable, prompt release coating composition comprising:
 at least one of a filler and a pigment, the filler being maltodextrin; and  
 55% to 85% of propylene glycol alginate and up to 10% lecithin, wherein the propylene glycol alginate is a primary film former of the composition and such that a 1% aqueous solution thereof has a viscosity in the range of about 1 to 500 mPa·s at 25° C.  
 
     
     
       5. The coating composition of  claim 4 , wherein the combination of the filler and the pigment comprises 10% to 40% by dry weight of the composition. 
     
     
       6. An edible, hardenable, prompt release coating composition comprising:
 at least one of a filler and a pigment, the pigment forming from 5% to 15% of the composition; and  
 55% to 85% of propylene glycol alginate and up to 10% lecithin, wherein the propylene glycol alginate is a primary film former of the composition and such that a 1% aqueous solution thereof has a viscosity in the range of about 1 to 500 mPa·s at 25° C.  
 
     
     
       7. The coating composition of  claim 6 , wherein the combination of the filler and the pigment comprises 10% to 40% by dry weight of the composition. 
     
     
       8. An edible, hardenable, prompt release coating composition comprising 55% to 85% of propylene glycol alginate, 10% to 30% maltodextrin, and 2% to 10% lecithin, wherein the propylene glycol alginate is a primary film former of the composition and such that a 1% aqueous solution thereof has a viscosity in the range of about 1 to 500 mPa·s at 25° C. 
     
     
       9. The coating composition of  claim 8 , further comprising from 3% to 12% of a secondary film former or a strengthening polymer. 
     
     
       10. The coating composition of  claim 9  wherein carrageenan is present at 5% to 10% by dry weight of the composition. 
     
     
       11. The coating composition of  claim 9  where hydroxyethylcellulose is present at 5% to 10% by dry weight of the composition. 
     
     
       12. An edible, hardenable, prompt release coating composition comprising 55% to 85% of propylene glycol alginate, 5% to 15% pigment, and 2% to 10% lecithin, wherein the propylene glycol alginate is a primary film former of the composition and such that a 1% aqueous solution thereof has a viscosity in the range of about 1 to 500 mPa·s at 25° C.